Chemistry_1031_day38_042909_actual

Chemistry_1031_day38_042909_actual - General Chemistry I...

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General Chemistry I CHE-1031 Dr. Jonathan M. Smith Wednesday, April 29
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The Chemical bond! Lewis dot structures continued Bond strengths Intramolecular (bonding) versus intermolecular forces Bonding => molecular geometry Valence shell electron pair repulsion (VSEPR) Read Chapter 10 Mastering Chemistry problems posted Final Exam practice posted
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Review… 1) Write skeletal structure H always terminal in oxyacid, H outside attached to O’s make least electronegative atom central N is central Tro, Chemistry: A Molecular Approach 3 2) Count valence electrons sum the valence electrons for each atom add 1 electron for each charge subtract 1 electron for each + charge N = 5 H = 1 O 3 = 3·6 = 18 Total = 24 e -
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chemical reactions involve breaking bonds in reactant molecules and making new bond to create the products the DH°reaction can be calculated by comparing the cost of breaking old bonds to the profit from making new bonds the amount of energy it takes to break one mole of a bond in a compound is called the bond energy in the gas state homolytically – each atom gets ½ bonding electrons Tro, Chemistry: A Molecular Approach 5
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the more electrons two atoms share, the stronger the covalent bond C ˹ C (837 kJ) > C=C (611 kJ) > C ʵ C (347 kJ) C ˹ N (891 kJ) > C=N (615 kJ) > C ʵ N (305 kJ) the shorter the covalent bond, the stronger the bond
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This note was uploaded on 05/09/2010 for the course CHEM 1031 taught by Professor Thomas during the Spring '06 term at Temple.

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Chemistry_1031_day38_042909_actual - General Chemistry I...

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